package imap

import (
	"strings"
	"testing"
)

func TestParseBody_multipartAlternativeBase64(t *testing.T) {
	raw := buildMultipartMessage(t, "alternative", []mimePart{
		{
			contentType: "text/plain; charset=utf-8",
			body:        []byte("SAMSUNG\nRéserver aux professionnels"),
			transferEnc: "base64",
		},
		{
			contentType: "text/html; charset=utf-8",
			body:        []byte("<p>SAMSUNG</p><p>Réserver aux professionnels</p>"),
			transferEnc: "base64",
		},
	})

	text, html := parseBody(raw)
	if !strings.Contains(text, "SAMSUNG") {
		t.Fatalf("text = %q, want decoded plain text", text)
	}
	if !strings.Contains(text, "professionnels") {
		t.Fatalf("text = %q, want utf-8 decoded content", text)
	}
	if !strings.Contains(html, "<p>SAMSUNG</p>") {
		t.Fatalf("html = %q, want decoded html", html)
	}
	if looksLikeRawMIME(text) || looksLikeRawMIME(html) {
		t.Fatal("parseBody returned raw MIME")
	}
}

func TestParseBody_headerlessMultipartBase64(t *testing.T) {
	withHeaders := buildMultipartMessage(t, "alternative", []mimePart{
		{
			contentType: "text/plain; charset=utf-8",
			body:        []byte("Hello MIME"),
			transferEnc: "base64",
		},
	})
	// Drop RFC822 headers — simulates IMAP body fetch without outer Content-Type.
	idx := strings.Index(string(withHeaders), "\r\n\r\n")
	if idx < 0 {
		t.Fatal("missing header/body separator")
	}
	raw := withHeaders[idx+4:]

	text, _ := parseBody(raw)
	if text != "Hello MIME" {
		t.Fatalf("text = %q, want Hello MIME", text)
	}
}

func TestParseBody_singlePartBase64(t *testing.T) {
	var b strings.Builder
	b.WriteString("From: a@b.com\r\n")
	b.WriteString("To: c@d.com\r\n")
	b.WriteString("Subject: test\r\n")
	b.WriteString("Content-Type: text/plain; charset=utf-8\r\n")
	b.WriteString("Content-Transfer-Encoding: base64\r\n")
	b.WriteString("\r\n")
	b.WriteString("SGVsbG8gYmFzZTY0") // "Hello base64"

	text, html := parseBody([]byte(b.String()))
	if text != "Hello base64" {
		t.Fatalf("text = %q, want Hello base64", text)
	}
	if html != "" {
		t.Fatalf("html = %q, want empty", html)
	}
}